Siburian, Robert. “Social Resilience and Forest Ecology Change: A Study on Around Forest Society in Simalungun District”. Jurnal Penelitian Kesejahteraan Sosial 16, no. 4 (March 8, 2018): 381–398. Accessed April 20, 2024. https://ejournal.kemensos.go.id/index.php/jpks/article/view/1405.